US Bridges

I-15 (SR-15) over Big Cottonwood Creek

Fair

Salt Lake County, Utah · Approx. 4200 So. on I-15 · Structure no. 0E1201

Built
1962
63 years old, rebuilt 1998
Condition
Fair
inspected October 2024
Type
Culvert
Concrete Continuous
Length
25 ft
2 main spans
Daily traffic
218,515
2014 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) over Big Cottonwood Creek is a concrete continuous culvert carrying I-15 (SR-15) over Big Cottonwood Creek in Salt Lake County, Utah. It was built in 1962 and reconstructed in 1998, so it is 63 years old, older than the Utah average of 40.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 218,515 vehicles a day, roughly 24% of them trucks, projected to reach 273,144 by 2034. The structure is 25 ft (7.5 m) long. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesI-15 (SR-15)
CrossesBig Cottonwood Creek
LocationApprox. 4200 So. on I-15
RouteInterstate 15
CountySalt Lake County
StateUtah
Coordinates40.68076, -111.90181
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.7 US tons
Inventory rating60.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length25 ft (7.5 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deck99 ft (30.2 m)

Traffic and service

Average daily traffic218,515 (2014)
Projected traffic273,144 by 2034
Trucks24%
Lanes on structure12
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-15 (SR-15) over Big Cottonwood Creek built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 1998.

What condition is I-15 (SR-15) over Big Cottonwood Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in October 2024.

How much traffic does I-15 (SR-15) over Big Cottonwood Creek carry?

About 218,515 vehicles per day (2014 count), of which roughly 24% are trucks.

How long is I-15 (SR-15) over Big Cottonwood Creek?

The structure is 25 ft (7.5 m) long with a longest span of 12 ft (3.7 m).

Who owns I-15 (SR-15) over Big Cottonwood Creek?

It is owned by the State Highway Agency.